primary transmission gear set Top Racing 17/39 ratio for Honda Bali SJ50

The Portuguese tuning specialists, Top Racing, are a symbol of high quality scooter components. Due to Advanced production techniques, and over 50 years of experience many European brands entrust their tuning to Top Racing. The relatively simple installation of The Top Racing transmission is another reason to look no further than the Portuguese brand. To increase performance and speed, you need more power and also a longer gear. Since most vehicles are factory-fitted with a very short gear, you should fit a longer gear to protect the engine from over-revving. Primary gears by Top Racing are pre-pressed and ready for assembly. Simply swap out the originals and you’re done!. Not really suitable for 50cc cylinders . factory specification Top Racing.: Ratio 17/39